Perforating punch



J. H. SIEMER PERFORATING PUNCH' Filed May 8. 1929 April 2l, 1931.

Patented Apr. 21,/ 1931 JOSEPHv H. SIEMER, OF ST. LOUIS, MISSOURI PERFORATING BUNCH Application 1ed Mai` 8, 1929. SerialiNo. 361,475.

My invention is an improvement in devices for punching holes, and'is in the form of an implement for punching holes in material b v which Athe cutting die/may be accurately cen- 5 tered anithe cut-out piece' ejected from the die. i

The primary object of my invention is tA-o provide an accurate perforating punch especially adapted for use' by pattern makers in the shoe manufacturing trade for facilitating the operation-,of forming the usual perforations in the patterns, in the present instance providing for quickly and accurately centering the punch on the dots or other guiding marks with provision for ejecting the cut-out portion of the material.

A further object of my invention is to provide a punching tool or implement of this character which is strong and durable in construction, simple and effective in operation, and in which the parts constituting the same can be readily separated for renewal or reair.

With these principal objects in view my invention consists of a manually operated punch for -forming perforations in material of different kinds 'comprising a handle portion inA the form of a bar one end of which is shaped to receive the blows of a hammer used in operating the punch while theother end is bored and threaded, a tubular die threaded in the outer end of the bore, a plunger working through the die to eject the cut-out material, andV a spring within the bore for actuating the plunger, the working end of the plunger being provided with a teat serving to center the punch for accuracy in properly lining the perforations; all as hereinafter fully described and more specifically set forth in the appended claims.

Figure 1 isa side elevation of a perforating through the punching tool or implement, and

punch constructed in accordance with my inf Figs. 4 and 5 are/detail views of the head of the punch ad'cutting die, respectively.

In carrying out my invention the body portion forming the handle 10 of the implement is a steel bar preferably cylindrical yin cross section with the end thereofagainst which the hammer strikes slightly beveled, as is usual in tools of this general character, while into the other end of said handle ex tends: a bore 11 threaded for a short distance trom its outer end, as, indicated at 12. Threaded into. the outer end of the bore is a tubular cutting die 13, with an integral collar 14 at the lower end of its threaded p0rtion; 13u.' corresponding in diameter with that ofthe bar or handle and an internal shoulder 15 at the upper end of the central bore 16 through said die. The lower end of the tubular .die is provided with a beveled cutting edge 17 which is circular in shape to form 70 a. round hole in the material, andfor the purpose of ejecting the cut-out material fro/1n the cutting die a plunger 18 is mounted in the. aforesaid bore 16 with a head 19 at its up per end adapted to engage the shoulder 15 for limiting theoutward movement of the plunger or ejector, it being noted that-,the length of the latter is such that itprojects slightly when the head is in engagement with the shoulder. The plunger 1s operated to eject the cut-out material b means of a helical spring 20 contained within the bore in the handle and interposed between the inner end of said bore and the head of the plunger, and

in order to accurately center the die the 5 plunger or ejector is rovided centrally with a projecting teat 21 s arpened to a point.

By reference to the drawings it will be. seen that the tubular cutting die is threaded into the end of the handle so as to be rigidly connected thereto, and that said die is reduced in diameter for a greater portion of its length from the cutting edge whereby it can be easily manipula-ted to locate the teat on .the dot or point at which the holeis to be made.

In the operation of the punch in perforating patterns the die is properly centered by means of the teat which is located to puncture the dot on the pattern and then by strik- 1,00

ing the upper end of the handle or bar with a hammer the die will cut through the material and the cut-out piece of material being forced into the tubular die will be ejected by 5 the springactuated plunger as the implement is removed. This operation is repeated with respect tothe other dots on the pattern to form the necessary perforations therein, and it will be obvious that the implement l0 can be manipulated quickly to facilitate the operation of perforating patterns. Furthermore by the articular construction and assemblage of tlie parts I rovide a strong Iand durable implement whic is of special utility to pattern makers in the shoe jnanufacturing trade, although of course it can be used by others for punching holes, and consequently the diameter of the circular cutting edge may l be increased or diminished according to the size of hole to be punched.

I claim:

A perforating punch for pattern makers comprisinur a bar forming the handle of the punch andohaving a longitudinal bore extend- 1n inwardly from the outer end thereof, a

tuular die threaded in the outer end of said bore and having an integral collar bearing against the end of the handle, the tubular die having an opening therethrough and the outer end portion thereof being reduced in diameter and ta ered from the said collar, an annular shouider at the inner end of the. opening through the tubular diel formed by cnlargingsaid opening, a plunger working in the tubular die'to eject the material cut out thereby and havin" a head at its u per end workin in the en arged portion o the opening an adapted to engage the aforesaid shoulder, a teat formed integrally with and projecting from the outer cnd of the plunger at the center thereof to form a point for centerin the punch, and a spring conned within t e bore to bear against the head of the plunger for projectin the same.

JOSEP H. SIEMER. 

